Aubrey gave away 13 of her baseball cards. if she now has 91 cards, how many cards did she start with? let c = the nunber of cards she started with.

Becca wants to mix fruit juice and soda to make a punch. she can buy fruit juice for $3 a gallon and soda for $4 a gallon. if she wants to make 28 gallons of punch at a cost of $3.25 a gallon, how many gallons of fruit juice and how many gallons of soda should she buy?